question

myhomebuzz avatar image
myhomebuzz asked

Lynx Power In really 1000A ?

The Lynx Power In, like the Distributor, are advertised with an intensity of 1000A. Without going into the technical details of scientific calculation, we take an average of 1.2A per mm2 (maximum of 3A per mm2 according to the calculation bases of one of the 3 world leaders in professional electrical boxes and safety for busbars). However, the two Lynx have a bar of 30 * 8 mm. This gives 240 mm2. We multiply by the technical average of 1.2 and the result is 288A, or by the maximum of 3, the result is 720A, but never the 1000A. Do you have more information to send me on this subject? Thanks in advance.

ampsbusbar
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2 Answers
Alexandra avatar image
Alexandra answered ·

@MyHomeBuzz

I think it would be 1000A peak, not 1000A constant. (Edited from rms as it is incorrect refernce, as I was really referring to a sustained or constant current) I do see the logic and maths in the calculations.

But the question is sort of a moot point. There is not system that can connect to the few points to rms the amps on that bar.

1000x48v it a 48kva system. When building that big you will need alot more space and better current sharing anyway so would not use it? I personally would not use it on those systems as a better setup for current sharing and heat dissipation is needed.

At 12v 1000A thats a 12kva system. I don't know any 12kva at 12v? I could be corrected, would rather think it is an ultra daft setup anyway the poor batteries never mind the bus bar.

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myhomebuzz avatar image myhomebuzz commented ·

@Alexandra

Thanks for feedback.

The calculation does not depend on logic, but on a mathematical fact.

The point is that Victron advertises 1000A on a 30x8mm bus bar, in the technical brochures as well as on the product.

Whether or not one uses the maximum intensity is not the question. The question is: is it correct that the intensity of the Lynx Power In is indeed possible with 1000A?

A simple example with only a Multiplus II 12-3000: when using peak of 6000W, this gives an intensity of 500A with cables in 2 x 50 mm2 positive and 2 x 50 mm2 negative (which is correct according to the formula S). So if we take the calculation of 30x8 mm => 240mm2 and 240 * 1.2 (temperature rise, k factor ..) => 288A, we are weak. But with a factor of 3 at the limit threshold (720A), it's good. But still no 1000A. And the calculation can also be done in 36, 48 or 2000V, where and how the information of 1000A is brought? This is my question

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kevgermany avatar image kevgermany ♦♦ myhomebuzz commented ·
This is really a question for Victron tech support not the user community.

I think many of us would be interested in the answer, though.


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myhomebuzz avatar image myhomebuzz kevgermany ♦♦ commented ·

@kevgermany

For sure. But since there are a lot of Victron Energy staff on this forum, I thought that an answer could be given directly to the whole community.

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kevgermany avatar image kevgermany ♦♦ myhomebuzz commented ·
They tend to reply if tagged directly.
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Phil Gavin avatar image Phil Gavin commented ·

"I think it would be 1000A peak, not 1000A rms."

-It's DC.

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myhomebuzz avatar image myhomebuzz Phil Gavin commented ·

@Phil Gavin

Maybe Phil, maybe.

But this is not demonstrated or correctly informed.

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Guy Stewart (Victron Community Manager) avatar image
Guy Stewart (Victron Community Manager) answered ·

Hi @MyHomeBuzz,

A lot of limits in power electronics are related to heat, and the capacity of the adjacent materials to withstand it, and how it is dissipated, that would be an integral part of the rated capacity and one that is not accounted for in typically conservative generalised information.

There is an extreme amount of info related to the details in this document if someone was really wanting to investigate for themselves.

http://copperalliance.org.uk/uploads/2018/03/section-2-0-current-carrying-capacity-of-busbars.pdf

While perhaps not intellectually satisfying, the Lynx distribution system has been deployed in many thousands of systems, and I have never heard of anyone ever overloading the bars leading to an issue.

I have heard and seen people inadequately connecting to the bars, and that leading to issues at the point of connection, but never the bars themselves.

Unless there is some instance of the rated current (or even less than) leading to an issue with a system, I don't think I can get much more internal info than what is published in the long standing spec.

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myhomebuzz avatar image myhomebuzz commented ·

Hi @Guy Stewart (Victron Community Manager)

I understand your answer or rather your point of view.

It is not because thousands or millions of people use a system that works, moreover, but the statement that goes with it. If we entered 200000A on a data sheet of a product, the same thousands of people would use the product without asking questions? Or what if the actual maximum current of 480A of a Lynx Power In bus bar was indicated? I doubt it too.

This calculation of 480A for a 30 x 8 mm bus bar is that given mathematically and physically tested by the CDA of the National Physical Laboratory in Teddington and in the US. The same as the link you transmitted. As a reminder: Amax = 24.9 • ( S^.5 • p^.39 • θ^.61 / √ ρ • (1 + α (θ + 10) ) ) for an ambient temperature of 30° Celsius.

We can assume that Victron simply indicated 1000A for the two bus bars, but this does not work like that. Let's look at the Lynx Shunt which is marked 500A with the same bus bar.

I am a Victron fan and have no doubts, however an effective answer would be appreciated on the calculation procedure for this advertised 1000A bus bar. A point of view on sales or accomplishments is not a technical statement. But it is the fruit of a leading company in its field which provides innovative technical solutions with certification.

That's why I'm a Victron fan.

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